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Manual Reference Pages  -  SNMP::INFO::CDP (3)

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NAME

SNMP::Info::CDP - SNMP Interface to Cisco Discovery Protocol (CDP) using SNMP

CONTENTS

AUTHOR

Max Baker

SYNOPSIS



 my $cdp = new SNMP::Info (
                             AutoSpecify => 1,
                             Debug       => 1,
                             DestHost    => router,
                             Community   => public,
                             Version     => 2
                           );

 my $class = $cdp->class();
 print " Using device sub class : $class\n";

 $hascdp   = $cdp->hasCDP() ? yes : no;

 # Print out a map of device ports with CDP neighbors:
 my $interfaces = $cdp->interfaces();
 my $cdp_if       = $cdp->cdp_if();
 my $cdp_ip       = $cdp->cdp_ip();
 my $cdp_port     = $cdp->cdp_port();

 foreach my $cdp_key (keys %$cdp_ip){
    my $iid           = $cdp_if->{$cdp_key};
    my $port          = $interfaces->{$iid};
    my $neighbor      = $cdp_ip->{$cdp_key};
    my $neighbor_port = $cdp_port->{$cdp_key};
    print "Port : $port connected to $neighbor / $neighbor_port\n";
 }



DESCRIPTION

SNMP::Info::CDP is a subclass of SNMP::Info that provides an object oriented interface to CDP information through SNMP.

CDP is a Layer 2 protocol that supplies topology information of devices that also speak CDP, mostly switches and routers. CDP is implemented in Cisco and some HP devices.

Create or use a device subclass that inherits this class. Do not use directly.

Each device implements a subset of the global and cache entries. Check the return value to see if that data is held by the device.

    Inherited Classes

None.

    Required MIBs

CISCO-CDP-MIB
MIBs can be found at ftp://ftp.cisco.com/pub/mibs/v2/v2.tar.gz

GLOBAL METHODS

These are methods that return scalar values from SNMP
$cdp->hasCDP() Is CDP is active in this device?

Accounts for SNMP version 1 devices which may have CDP but not cdp_run()

$cdp->cdp_run() Is CDP enabled on this device? Note that a lot of Cisco devices that implement CDP don’t implement this value. @#%$!

(cdpGlobalRun)

$cdp->cdp_interval() Interval in seconds at which CDP messages are generated.

(cdpGlobalMessageInterval)

$cdp->cdp_holdtime() Time in seconds that CDP messages are kept.

(cdpGlobalHoldTime)

$cdp->cdp_gid() Returns CDP device ID.

This is the device id broadcast via CDP to other devices, and is what is retrieved from remote devices with $cdp->id().

(cdpGlobalDeviceId)

TABLE METHODS

These are methods that return tables of information in the form of a reference to a hash.

    CDP CACHE ENTRIES

$cdp->cdp_capabilities() Returns Device Functional Capabilities. Results are munged into an ascii binary string, MSB. Each digit represents a bit from the table below from the CDP Capabilities Mapping to Smartport Type table within the Cisco Small Business 200 Series Smart Switch Administration Guide, <http://www.cisco.com/c/en/us/support/switches/small-business-200-series-smart-switches/products-maintenance-guides-list.html>:

(Bit) - Description
(0x400) - Two-Port MAC Relay.
(0x200) - CAST Phone Port / CVTA / Supports-STP-Dispute depending upon platform.
(0x100) - Remotely-Managed Device.
(0x80) - VoIP Phone.
(0x40) - Provides level 1 functionality.
(0x20) - The bridge or switch does not forward IGMP Report packets on non router ports.
(0x10) - Sends and receives packets for at least one network layer protocol. If the device is routing the protocol, this bit should not be set.
(0x08) - Performs level 2 switching. The difference between this bit and bit 0x02 is that a switch does not run the Spanning-Tree Protocol. This device is assumed to be deployed in a physical loop-free topology.
(0x04) - Performs level 2 source-route bridging. A source-route bridge would set both this bit and bit 0x02.
(0x02) - Performs level 2 transparent bridging.
(0x01) - Performs level 3 routing for at least one network layer protocol.

Thanks to Martin Lorensen for a pointer to the original information and CPAN user Alex for updates.

(cdpCacheCapabilities)

$cdp->cdp_domain() Returns remote VTP Management Domain as defined in CISCO-VTP-MIB::managementDomainName

(cdpCacheVTPMgmtDomain)

$cdp->cdp_duplex() Returns the port duplex status from remote devices.

(cdpCacheDuplex)

$cdp->cdp_id() Returns remote device id string

(cdpCacheDeviceId)

$cdp->cdp_if() Returns the mapping to the SNMP Interface Table.

Note that a lot devices don’t implement $cdp->cdp_index(), So if it isn’t around, we fake it.

In order to map the cdp table entry back to the interfaces() entry, we truncate the last number off of it :



  # it exists, yay.
  my $cdp_index     = $device->cdp_index();
  return $cdp_index if defined $cdp_index;

  # if not, lets fake it
  my $cdp_ip       = $device->cdp_ip();
   
  my %cdp_if
  foreach my $key (keys %$cdp_ip){
      $iid = $key;
      ## Truncate off .1 from cdp response
      $iid =~ s/\.\d+$//;
      $cdp_if{$key} = $iid;
  }

  return \%cdp_if;



$cdp->cdp_index() Returns the mapping to the SNMP2 Interface table for CDP Cache Entries.

Most devices don’t implement this, so you probably want to use $cdp->cdp_if() instead.

See cdp_if() entry.

(cdpCacheIfIndex)

$cdp->cdp_ip() If $cdp->cdp_proto() is supported, returns remote IPV4 address only. Otherwise it will return all addresses.

(cdpCacheAddress)

$cdp->cdp_addr() Returns remote address

(cdpCacheAddress)

$cdp->cdp_platform() Returns remote platform id

(cdpCachePlatform)

$cdp->cdp_port() Returns remote port ID

(cdpDevicePort)

$cdp->cdp_proto() Returns remote address type received. Usually IP.

(cdpCacheAddressType)

$cdp->cdp_ver() Returns remote hardware version

(cdpCacheVersion)

$cdp->cdp_vlan() Returns the remote interface native VLAN.

(cdpCacheNativeVLAN)

$cdp->cdp_power() Returns the amount of power consumed by remote device in milliwatts munged for decimal placement.

(cdpCachePowerConsumption)

$cdp->cdp_cap() Returns hash of arrays with each array containing the system capabilities supported by the remote system. Possible elements in the array are Router, Trans-Bridge, Source-Route-Bridge, Switch, Host, IGMP, Repeater, VoIP-Phone, Remotely-Managed-Device, Supports-STP-Dispute, and Two-port Mac Relay.

Data Munging Callback Subroutines

$cdp->munge_power() Inserts a decimal at the proper location.
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